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Wave Hub Appendix K to the Environmental Statement

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Wave Hub Appendix K to the Environmental Statement South West of England Regional Development Agency Wave Hub Appendix K to the Environmental Statement June 2006 South West Wave Hub EIA BASELINE FISHERIES SURVEYS Survey No. 1 (July 05) Report July 2005 REPORT No. 05/J/1/06/0782/0521 Client : Halcrow Group Ltd Ash House Falcon Road Sowton Exeter EX2 7LB Emu Ltd Head Office 1 Mill Court The Sawmills Durley Southampton Hampshire SO32 2EJ Halcrow Group Ltd South West Wave Hub – EIA Baseline Fisheries Surveys CONTENTS 1 Introduction 1 2 Study Objectives 1 3 Methodologies 1 4 Results 4 5 Discussion 7 6 Audit Trail 8 Appendices List of Tables Table 1 Summary of sampling events (July 2005) List of Plates Plate 1 Retrieval of pots aboard Swift, 12th July 2005 Plate 2 Catch of spider crab (Maja squinado) landed aboard Girl Linda Plate 3 Monkfish (Lophius piscatorius) landed aboard Girl Linda at Station 8 Plate 4 Pollack (Pollachius pollachius) landed aboard Ellie V Plate 5 Sunfish (Mola mola) sighted aboard Ellie V Plate 6 Basking shark (Cetorhinus maximus) sighted aboard Ellie V Plate 7 Common dolphins (Delphinius delphis) sighted aboard Ellie V List of Figures Figure 1 Position of offshore potting survey stations (Swift) Figure 2 Position of inshore potting survey stations (Chloe Estelle) Figure 3 Position of otter trawl survey tows (Girl Linda) Figure 4 Position of hand-lining survey stations (Ellie V) Figure 5 Catch ratio (catch per pot) of main species from offshore potting survey Figure 6 Catch ratio (catch per pot) of main species from inshore potting survey Figure 7 Total numbers of species per station (otter trawling) Figure 8 Total abundance of individuals per station (otter trawling) Figure 9 Total numbers of pollack caught at hand-lining survey stations Figure 10 Size distribution of pollack caught in July 2005 survey Appendices Appendix I Survey Logs Appendix II Survey Data 05/J/1/03/0685/0508/FINAL Emu Ltd. Halcrow Group Ltd South West Wave Hub – EIA Baseline Fisheries Surveys 05/J/1/03/0685/0508/FINAL Emu Ltd. Halcrow Group Ltd South West Wave Hub – EIA Baseline Fisheries Surveys 1. INTRODUCTION 1.1 This report presents the findings from the first of four fisheries resource surveys undertaken by Emu Ltd on behalf of Halcrow Group Ltd as part of the Environmental Impact Assessment (EIA) process being undertaken in relation to the South West Wave Hub project. 1.2 Halcrow Group Ltd is managing the EIA process for this development, which is being funded by the South West Regional Development Agency (SWRDA). 2. STUDY OBJECTIVES 2.1 The main objectives of the fisheries surveys are detailed below: - To collect baseline data on the composition of fish resources within the study area in order to inform the EIA process being undertaken for the South West Wave Hub project; - To collect baseline data on the spatial and temporal distribution of fish resources within the study area in order to inform the EIA process being undertaken for the South West Wave Hub project; - To involve the local fishing community in the data gathering process for the EIA. - The surveys are in no way to be intended as a detailed stock assessment of any fishery species. 2.2 In addition to these fish resource surveys, a commercial fisheries intensity study has also been commissioned. This study will describe commercial fishing activity and patterns in the study area. 3. METHODOLOGY 3.1 The surveys were designed and planned following consultation and meetings with members of the local fishing community and representatives of Cornwall Sea Fisheries Committee (CSFC). Following discussions, it was agreed to undertake a series of four fish resource surveys in order to develop some understanding of the seasonal changes in the fishery. 3.2 The surveys were undertaken aboard local commercial fishing vessels with experienced local skippers who were always consulted during the field work with respect to sampling strategy. Emu Ltd. was represented on each survey by an experienced marine ecologist, with the exception of the hand-lining for mackerel, where data was recorded directly by the skipper. 3.3 The gear used for otter trawling, potting and hand-lining was the same as that employed during commercial fishing activities. 3.4 The first survey was undertaken on Tuesday 12th and Wednesday 13th July 2005. Table 1 summarises the schedule for the first survey. 05/J/1/03/0685/0508/FINAL 1 Emu Ltd. Halcrow Group Ltd South West Wave Hub – EIA Baseline Fisheries Surveys Date Survey Undertaken Vessel (Skipper) Emu Staff aboard Potting Survey 12/07/05 Swift (John Carter) Alec Moore (offshore) Potting Survey Chloe Estelle 12/07/05 Jo Weir (inshore) (Reg Easterbrook) Girlinda 13/07/05 Otter trawling Alec Moore (Chris Stevens) Ellie V 13/07/05 hand-lining Jo Weir (Michael Veale) 1st survey not hand-lining for Sally Ann of Navax NA yet undertaken mackerel (Peter Ghey) Table 1 Summary of sampling events (July 2005) 3.5 The preliminary positions for the survey stations were chosen in order to sample locations within and outside the proposed wave hub exclusion zone and also along the proposed route of the site to shore cable. Co-ordinates were calculated using a GIS system and issued to the skippers via post prior to the surveys so that they could input these into their vessel’s GPS. This provided them with an opportunity to comment as to whether any stations selected by Emu were not suitable for any reason, i.e. in an area of beam trawling activity (unsuitable for pots) or on hard ground (unsuitable for trawling). 3.6 Where some stations were indeed inappropriate, the skippers suggested more appropriate locations which were agreed by Emu staff. On the actual day of the survey, all survey positions were recorded on the vessel using the vessel’s own GPS system. All GPS systems used were based on the WGS84 datum. 3.7 For the potting surveys, the positions when hauling began and ended were noted, whilst for the trawling the start and end positions of each tow were noted. With respect to the hand-lining on wrecks and hard ground, a single position was noted, around which fishing was concentrated for 30 minutes. 3.8 Survey logs and positions are appended. Weather, sea state and other information (e.g. other vessels) were also recorded as appropriate. Specific Survey Methodologies (1) Potting Surveys 3.9 Two separate potting surveys were undertaken in order to obtain data from the offshore wave hub area and closer inshore in the area of the site to shore cable route. The offshore area was fished by Swift whilst the inshore area was fished by Chloe Estelle. 3.10 For both vessels, strings of 25 pots were shot on the afternoon of Sunday 10th July. All pots were new & parlour-type, and baited with both dogfish (Scyliorhinus sp.) and scad (Trachurus trachurus). The pots were subsequently retrieved on 12th July, resulting in a soak time of approximately 48 hours. 3.11 Upon retrieval, the following was noted for every pot: - The numbers of sized, under-sized and soft brown crab; - The numbers of sized, under-sized and soft spider crab; and - The numbers of sized under-sized and berried lobsters. 05/J/1/03/0685/0508/FINAL 2 Emu Ltd. Halcrow Group Ltd South West Wave Hub – EIA Baseline Fisheries Surveys On every 5th pot, measurements were taken on the carapace width of crabs and carapace length of lobsters. 3.12 The positions of the stations fished by Swift are shown in Figure 1 whilst the stations fished by Chloe Estelle are shown in Figure 2. (2) Otter Trawling Survey 3.13 A commercial otter trawl gear was used, with approximately 85ft spread & 9ft lift. The trawl was fitted with a 85mm cod-end mesh. Tow lengths varied from 5 minutes to 15 minutes. 3.14 Upon retrieval of the catch, all fish species caught were recorded and length measurements taken. Where large catches were landed, sub-samples were taken to undertake length measurements and an estimate of numbers landed. 3.15 Photographs were also taken of the catch upon being landed. 3.16 The positions of the tows are shown in Figure 3. (3) Hand-lining Survey 3.17 The commercial hand-lining gear comprised of a set of seven hooks baited with rubber eels. Hand-lining was undertaken for 30 minutes at each site. 3.18 Each time the line was under tension due to fish being caught, the hand-lining gear was brought to the surface, and the fish were released. The hand-line was then placed back into the water. This was repeated until the 30 minutes period was completed. 3.19 Upon retrieval of catch, species were identified, enumerated and total length measurements were taken. Photographs of the species caught (pollack only) were taken. 3.20 The positions of the hand-lining locations are shown in Figure 4. 05/J/1/03/0685/0508/FINAL 3 Emu Ltd. Halcrow Group Ltd South West Wave Hub – EIA Baseline Fisheries Surveys 4. RESULTS 4.1 The following section of the report presents the key results from the first fisheries surveys undertaken on 12-13th July 2005. Summary data sheets are included in the Appendix I. Potting Survey aboard Swift 4.2 Potting was carried out at a total of 7 sites. The main species recorded in the pots were brown crab (Cancer pagurus), with smaller numbers of spider crab (Maja squinado) and lobster (Homarus) also recorded. 4.3 All catches of crab species and lobster were recorded and identified as sized/under-sized or soft. Over the total number of pots, under-sized brown crabs were the highest number recorded, with over 200 individuals noted.
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